Key facts
- Vitamin D deficiency may cause no noticeable symptoms.
- Fatigue or muscle and bone discomfort can occur but are not specific to vitamin D deficiency.
- A blood test is used to assess vitamin D status when testing is clinically appropriate.
- Symptoms alone cannot tell whether your vitamin D level is low.
- Vitamin D testing does not need to be part of every routine health screening.
Signs and symptoms
Many people with vitamin D deficiency have no obvious symptoms.
When symptoms occur, they can be nonspecific and may include fatigue or muscle and bone discomfort. These symptoms have many possible causes, so they should not be assumed to result from low vitamin D without appropriate assessment.
Risk factors
Limited vitamin D production or intake
Health conditions that can affect vitamin D absorption or metabolism
Increasing age or other circumstances that may increase the likelihood of low vitamin D
A previous low vitamin D result
Common causes
Vitamin D deficiency can develop when the body does not obtain, produce or absorb enough vitamin D, or when health factors affect how vitamin D is processed. The reason for a low result depends on the person's overall health and circumstances.
How it is checked
Vitamin D status is assessed with a blood test. A doctor may consider testing when symptoms, health history or other risk factors make vitamin D deficiency relevant. The result should be interpreted using the laboratory's reference range and the person's clinical context.
Assessment and investigations
Vitamin D
A vitamin D blood test measures vitamin D status and can help identify whether the level is low. The result needs to be interpreted using the laboratory reference range and the person's clinical context.
When to see a doctor
Consider speaking with a doctor if you have persistent unexplained fatigue or muscle and bone discomfort, have previously had a low vitamin D result, or want to know whether vitamin D testing is appropriate for your health situation.
Frequently asked questions
What are the symptoms of vitamin D deficiency?
Vitamin D deficiency may cause no obvious symptoms. When symptoms occur, they can include fatigue or muscle and bone discomfort, but these problems can also have many other causes.
How do I know if my vitamin D is low?
A blood test is used to assess vitamin D status. Symptoms alone cannot tell whether your vitamin D level is low.
Does fatigue mean I have vitamin D deficiency?
No. Fatigue is nonspecific and can have many causes. Vitamin D deficiency is one possible consideration, but testing should be based on your overall health and clinical context.
Does everyone need a vitamin D test?
Not necessarily. Vitamin D testing may be useful in selected situations, but the need for testing depends on symptoms, health history and individual risk factors.